• Title, Summary, Keyword: PDMS

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Preparation of PDMS Surface Modifier Using Silane-Functionalized Polymer Precursor Manufacture and Their Properties (실란 기능화 아크릴 고분자 전구체를 이용한 PDMS 표면 개질제 제조 및 표면 물성)

  • Shin, Jae-Hyeon;Kim, Nahae;Kim, Juyoung
    • Journal of Adhesion and Interface
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    • v.19 no.4
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    • pp.154-162
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    • 2018
  • Plasma treatment and corona treatment have been used for surface modification of polydimethylsiloxane (PDMS) film by activating its surface with the -OH group. Adhesion promoter or coupling agent was also used to improve adhesion of PDMS film with various materials. However, obtained hydrophilicity onto the surface of PDMS films with those processes was transient and vulnerable. In this study, a new alkoxysilane-functionalized acrylic polymer precursor was first synthesized by copolymerization process, and then was reacted with HO-terminated PDMS through condensation reaction to prepare a new surface modifier for PDMS film. The structure and molecular weight of the prepared surface modifier were confirmed by 1H-NMR and GPC measurement. Surface properties of surface modifier-coated PDMS films were also investigated by using XPS, ATR and WCA analysis. The adhesion between the PDMS film and the surface modifier was tested using cross-cut test.

Analysis on Effective Elastic Modulus and Deformation Behavior of a Stiffness-Gradient Stretchable Electronic Package with the Island-Bridge Structure (Island-Bridge 구조의 강성도 경사형 신축 전자패키지의 유효 탄성계수 및 변형거동 분석)

  • Oh, Tae Sung
    • Journal of the Microelectronics and Packaging Society
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    • v.26 no.4
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    • pp.39-46
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    • 2019
  • A stiffness-gradient soft PDMS/hard PDMS/FPCB stretchable package of the island-bridge structure was processed using the polydimethylsiloxane (PDMS) as the base substrate and the more stiff flexible printed circuit board (FPCB) as the island substrate, and its effective elastic modulus and stretchable deformation characteristics were analyzed. With the elastic moduli of the soft PDMS, hard PDMS, and FPCB to be 0.28 MPa, 1.74 MPa, and 1.85 GPa, respectively, the effective elastic modulus of the soft PDMS/hard PDMS/FPCB package was analyzed as 0.58 MPa. When the soft PDMS of the soft PDMS/hard PDMS/FPCB package was stretched to a tensile strain of 0.3, the strains occurring at hard PDMS and FPCB were found to be 0.1 and 0.003, respectively.

Gas Permeation of CO2 and N2 through PDMS-HNT and PDMS-mHNT Composite Membranes (PDMS-HNT과 PDMS-mHNT 복합막을 통한 CO2와 N2의 기체투과)

  • Lee, Seul Ki;Hong, Se Ryeong
    • Applied Chemistry for Engineering
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    • v.29 no.1
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    • pp.67-76
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    • 2018
  • In this study, PDMS-HNT and PDMS-mHNT composite membranes were prepared by the addition of halloysite nanotube (HNT) and modified HNT (mHNT) to PDMS. To investigate the physico-chemical characteristics of composite membranes, analytical methods such as FT-IR, XRD, TGA, and SEM were utilized. The gas permeability and selectivity properties of $N_2$ and $CO_2$ were evaluated. In particular, the PDMS-HNT with 10 wt% HNT and PDMS-mHNT with 5 wt% mHNT showed the highest $CO_2/N_2$ selectivity and $CO_2$ permeability at $35^{\circ}C$, respectively. Overall, PDMS-HNT and PDMS-mHNT composite membranes improved the $CO_2/N_2$ selectivity compared to that of using PDMS membrane.

Preparation and Characterization of PTMSP/PDMS-zeolite Composite Membranes for Gas Separation (기체분리를 위한 PTMSP/PDMS-zeolite 복합막의 제조 및 특성)

  • Kim, Na-Eun;Kang, Tae-Beom;Hong, Se Lyung
    • Membrane Journal
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    • v.22 no.5
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    • pp.342-351
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    • 2012
  • In this study, PTMSP[poly(1-trimethylsilyl-1-propyne)]/PDMS[poly(dimethylsioxane)]-NaY zeolite and PTMSP/PDMS-NaA zeolite composite membranes were made to incorporate zeolite into PTMSP/PDMS graft copolymer in order to improve the selectivity and thermal stability, the drop of permeability by physical aging effect during long period of time for the PTMSP membrane. To investigate the physico-chemical characteristics of composite membranes, the analytical methods such as FT-IR, $^1H$-NMR, TGA, SEM, and GPC have been utilized. The gas permeability and selectivity properties of $H_2$ and $N_2$ were evaluated. The permeability of the PTMSP/PDMS-NaY zeolite and PTMSP/PDMS-NaA zeolite composite membranes than PTMSP/PDMS graft copolymer membrane increased, increased as zeolite content increased. On the contrary, the selectivity ($H_2/N_2$) of the composite membranes decreased as zeolite content increased. PTMSP/PDMS-NaA zeolite composite membrane showed better permeability and separation factor than PTMSP/PDMS-NaY zeolite composite membrane.

Fabrication of PDMS microlens for optical detection (광학적 검출을 위한 PDMS 마이크로렌즈의 제작)

  • Park, Se-Wan;Kim, Hyeon-Cheol;Chun, Kuk-Jin
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.46 no.4
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    • pp.15-20
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    • 2009
  • In a detection system based on laser light scattering, focusing an excitation laser beam into a focal point of a channel in a microfluidic chip is important for obtaining the highest excitation intensity, and consequently for obtaining a laser light scattering signal using a photodetector with a high efficiency. In this paper, we present a polydimethylsiloxane (PDMS) microfluidic chip consisting of an integrated PDMS microlens for cell detection based on laser light scattering. We fabricated PDMS microlens for optical detection system by simply putting down on PDMS chips. The PDMS microlens was fabricated by photoresist reflow and replica molding. This fabrication technique is simple and has an excellent property in terms of the microlens and a high-dimensional accuracy. The PDMS microlens integrated on the PDMS microfluidic chip has been verified to improve the laser intensity, and accordingly, the signal-to-noise ratio and sensitivity of laser light scattering detection for red blood cells(RBCs)

Preparation and Permeation Characteristics of PDMS-b-PMMA Copolymer Membrane (PDMS-b-PMMA 공중합체 막의 제조 및 투과특성)

  • Kang, Tae-Beom;Cho, A-Ra;Lee, Hyun-Kyung
    • Membrane Journal
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    • v.18 no.3
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    • pp.219-225
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    • 2008
  • In this research, polydimethylsiloxane-polymethylmethacrylate (PDMS-PMMA) block copolymer was synthesized from polydimethylsiloxane (PDMS) and methylmethacrylate (MMA) monomer using atom transfer radical polymerization (ATRP). The synthesis characterization of the PDMS-b-PMMA copolymer membrane was carried out by a FT-IR, $^1H$-NMR, GPC and DSC. The permeabilities of nitrogen and hydrogen gases were observed being $1.2{\sim}l.5$ barrer and $6.2{\sim}10.5$ barrer, respectively. Simultaneously, selectivities of hydrogen against nitrogen were $5.3{\sim}6.9$. The permeability and selectivity of PDMS-b-PMMA copolymer membrane were showed lower than the PDMS membrane, but higher than the PMMA membrane.

Volatile Components Analysis using SPME in Traditional Aromatic Plant Resources, Zanthoxylum schinifolium Siebold et Zucc. and Z. piperitum DC (SPME법을 이용한 전통 향료 유전자원 산초 및 초피의 정유성분 분석)

  • Cho, Min-Gu;Chae, Young-Am;Song, Ji-Sook
    • Korean Journal of Medicinal Crop Science
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    • v.9 no.3
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    • pp.192-197
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    • 2001
  • This study was carried out to select proper SPME fiber for volatile component analysis in Zanthoxylum schinifolium and Z. piperitum. PDMS, PDMS/DVB and CAR/PDMS were better for single standard absorption analysis. PDMS and PDMS/DVB showed similar results in comparison between direct injection and the mixture of 24 single standards as well as the mixture of 10 single standards. PDMS and PDMS/DVB were not different each other in absorption patterns between direct injection and headspace SPME regardless of split ratio of GC injection port. However PDMS/DVB rather than PDMS was effective in absorbing the sesquiterpenes within 30-40 minutes as using the SDE extracts from Z. schinifolium and Z. piperitum.

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Elastic Properties and Repeated Deformation Reliabilities of Stiffness-Gradient Stretchable Electronic Packages (강성도 경사형 신축 전자패키지의 탄성특성 및 반복변형 신뢰성)

  • Han, Kee Sun;Oh, Tae Sung
    • Journal of the Microelectronics and Packaging Society
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    • v.26 no.4
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    • pp.55-62
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    • 2019
  • Stiffness-gradient stretchable electronic packages of the soft PDMS/hard PDMS/FPCB structure were processed using the polydimethylsiloxane (PDMS) as the base substrate and the more stiff flexible printed circuit board (FPCB) as the island substrate. The elastic characteristics of the stretchable packages were estimated and their long-term reliabilities on stretching cycles and bending cycles were characterized. With 0.28 MPa, 1.74 MPa, and 1.85 GPa as the elastic moduli of the soft PDMS, hard PDMS, and FPCB, respectively, the effective elastic modulus of the soft PDMS/hard PDMS/FPCB package was estimated as 0.6 MPa. The resistance of the stretchable packages varied for 2.8~4.3% with stretching cycles ranging at 0~0.3 strain up to 15,000 cycles and for 0.9~1.5% with 15,000 bending cycles at a bending radius of 25 mm.

Stretchable Deformation-Resistance Characteristics of the Stiffness-Gradient Stretchable Electronic Packages Based on PDMS (PDMS 기반 강성도 경사형 신축 전자패키지의 신축변형-저항 특성)

  • Park, Dae Ung;Oh, Tae Sung
    • Journal of the Microelectronics and Packaging Society
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    • v.26 no.4
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    • pp.47-53
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    • 2019
  • Stiffness-gradient stretchable electronic packages of the soft PDMS/hard PDMS/PTFE structure were processed using the polydimethylsiloxane (PDMS) as the base substrate and the more stiff polytetrafluoroethylene (PTFE) as the island substrate, and their stretchable deformation-resistance characteristics were characterized. The flip-chip joints, formed by bonding the chip bumps of 50 ㎛-diameter onto the PDMS/PTFE substrate pads, exhibited an average contact resistance of 96 mΩ. When the stretchable package of the soft PDMS/hard PDMS/PTFE structure was deformed to 30% elongation, the strain on the PTFE was restrained to 1%, resulting in a negligible resistance increase of 1% in the daisy-chain circuit formed on the PTFE island substrate. The circuit resistance increased for 1.7% after 2,500 cycles of 0~30% stretchable deformation.

Fabrication of PDMS Microlens Using Electrohydrodynamic Atomization (정전분사를 이용한 PDMS 마이크로렌즈의 제작)

  • Kang, Tae-Ho;Yang, Sang-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.10
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    • pp.1841-1846
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    • 2008
  • In this paper, we present the fabrication of microlens by electrohydrodynamic atomization(EHDA) of PDMS prepolymer. The diameter and contact angle of PDMS microlens can be altered by changing the applied voltage and substrate temperature at the experimental setup. It is considered that PDMS microlens can be integrated into the Lab-on-a-chip directly without any photolithographic process by EHDA. The property of PDMS microlens is confirmed by transmitting and measuring the Gaussian beam through microlens.